Abstract: A sensor layout evaluation model based on the technique for order preference by similarity to ideal solution (TOPSIS) was established to make up the layout deficiencies of empirical design. First， the indices which had great impacts on the choice of sensor-layout programs were selected according to the technical conditions， economic conditions and engineering conditions to build evaluation index system. Second， considering the influence of the indices at the edge state on the weight， the variable weight calculation method was used to get the index weights of all schemes. Finally， comprehensive advantages and disadvantages of each scheme were calculated by TOPSIS. This method was used to evaluate microseismic monitoring sensor layout programs to obtain the good and bad of each program. This model provides a good way for the layout of microseismic monitoring sensors.

Key words: microseismic monitoring, sensor layout, scheme evaluation, TOPSIS(technique for order preference by similarity to ideal solution), variable weights theory